Correct spelling typo in "Quicktask link" sub -head

Changed Quicktask link section text to refer to title which appears as a mouseover the icon, and to state that the language string needs to be in the .sys.ini lanuage file

Added new sub-section Quicktask Icon with explanation and example.

Added fontawesome icon example to the Example section

NB there is also a <quicktask-permission> tag but I can find no information how to use it.